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Table 1 D-dimer assay and CTPA sensitivity, specificity and predictive values (95% confidence intervals)

From: Computed tomographic pulmonary angiography and pulmonary embolism: predictive value of a d-dimer assay

  D-dimer assay:
Results based on number of positive CTPA results
CTPA
  N = 41 (initial results) N = 36 (results after specialist review) N = 405
Sensitivity 95.1 (82.2-99.2) 100 (88.0-100) x
Specificity 16.0 (11.1-22.5) 16.7 (11.7-23.1) 98.5 (96.4-99.5)
Positive predictive value 21.0 (15.5-27.7) 19.4 (14.1-25.9) 92.4 (82.5-97.2)
Negative predictive value 93.3 (76.5-98.8) 100 (85.9-100) x